State three reasons why an organisation may opt to develop its own software in-house rather than buy off-the-shelf software.
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Write each of the following acronyms in full as used in computing.
When purchasing a computer, the clock speed, RAM size, Hard disk size and monitor size are often quoted. State the unit for measuring:(a) Clock speed; .
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State the purpose of each of the following memories in a computer system. RAM and Hard disk
3/1/2021
State the purpose of each of the following memories in a computer system. RAM and Hard disk
(a) RAM
Holds data that is urgently need by the processor,
Random-access memory is a form of computer memory that can be read and changed in any order, typically used to store working data and machine code.
(b) Hard disk
Used to hold large volumes of data that is not urgently required by the processor — also for back up of OS and data.
Holds data that is urgently need by the processor,
Random-access memory is a form of computer memory that can be read and changed in any order, typically used to store working data and machine code.
(b) Hard disk
Used to hold large volumes of data that is not urgently required by the processor — also for back up of OS and data.
Study the following diagram and answer the questions that follow
From the diagram:
(i) Name two devices that are used for long term storage
(ii) Name three peripherals shown on the diagram that are used for input
(iii) Name two other devices that a computer Aided Design (CAD) user might wish to add to the set- up above
(b)A customer wishes to purchase a computer system. The customer can buy a word processor, spreadsheet, database and a drawing package separately or as an integrated package. State three advantages why many computer users prefer integrated packages to separate packages.
(c) (i) An anti- virus software installed in a computer is loaded into the main memory each time the computer is switched on
Explain three ways in which computer virus are spread from one computer to another
(ii) Give two reasons why an anti virus package should be updated regularly
(i) Name two devices that are used for long term storage
(ii) Name three peripherals shown on the diagram that are used for input
(iii) Name two other devices that a computer Aided Design (CAD) user might wish to add to the set- up above
(b)A customer wishes to purchase a computer system. The customer can buy a word processor, spreadsheet, database and a drawing package separately or as an integrated package. State three advantages why many computer users prefer integrated packages to separate packages.
(c) (i) An anti- virus software installed in a computer is loaded into the main memory each time the computer is switched on
Explain three ways in which computer virus are spread from one computer to another
(ii) Give two reasons why an anti virus package should be updated regularly
RESPONSES
(a) (i)ROM
Hard disk 2GB HDD
(ii)
To enable remove upcoming viruses/new viruses
For maintenance purposes (patches)
To upgrade/replace outdated antiviruses.
Hard disk 2GB HDD
(ii)
- Scanner
- Mouse
- Floppy drive
- CD drive
- Network
- HDD drive
- Plotter
- High resolution graphics adapter/S VGA/XVGA
- Graphic tablet
- Digitizer
- Light pen
- Touch screen
- one can switch between applications fast/easily
- integrated use less storage space due to sharing of the some applications
- they are cheaper
- easier to install
- easier to learn since they have related features/to use
- maintenance is easier since only one vendor will be responsible in case of any problem
- Ease of transfer of data from one application to the other.
- using storage media from infected computer
- internet use browsing
- Downloading files
- Through the network
- Opening unsolicited /questionable mails
- Playing fake games/using fake games
- Use of pirated software
- Freeware/shareware.
To enable remove upcoming viruses/new viruses
For maintenance purposes (patches)
To upgrade/replace outdated antiviruses.
The diagram below shows a layout of a computer network used by a law farm. A workstation and a printer are located in every consulting room
(i) Name the network topology depicted in the diagram
(ii) Name the device labeled D
(iii) State four functions of the device labeled ‘server’
(iv) Give two advantages and one disadvantage of the above network design
(v) If the firm intends to open extra offices in two different towns, name any three hardware devices that would be required
(vi) State any two security problems that might arise by linking the offices in different towns
(b) What is spyware?
(ii) Name the device labeled D
(iii) State four functions of the device labeled ‘server’
(iv) Give two advantages and one disadvantage of the above network design
(v) If the firm intends to open extra offices in two different towns, name any three hardware devices that would be required
(vi) State any two security problems that might arise by linking the offices in different towns
(b) What is spyware?
RESPONSES
(a) (i)Star
(ii) Hub or Switch/Router
(iii)File sharing
Advantages .
(ii) Hub or Switch/Router
(iii)File sharing
- Manage users accounts
- Manage host applications
- Manage files/store/hold tiles for other workstations
- Control the use of resources
- Can be a link to another network/gateways
- Manage/control workstations
- Contain programs which are used by workstations
- Receives request/information from and to the workstations
Advantages .
- Allow for concentration of network resources
- Give administrator central focal point for management
- Easy to configure/downgrade/upscale
- Easy to trouble shoot
- Faster connection
- Each work station does not have to queue for printing
- If a link to one of the workstations breaks down, the others can continue functioning independently
- Costly to install
- Costly to install because each workstation has a its own printer
- Uses more cables than ring and bus topologies
- In case the server or the hub fails the network facilities are lost.
- Installation is time consuming because each node forms a segment of its own.
- Server
- Modem
- Router
- Firewall
- Extra cables
- Repeater
- Bridge
- Transceiver
- Satellite dishes
- Printers
- Keyboard
- Monitor
- Telephone line
- Hacking
- Tapping/trespassing
- Virus infections
- Vandalism of cables
- Cracking
(a) Name and explain the function of the keyboard keys represented by the following symbols (2mks)
- (i) Tab Key Used to remove text/ cursor to the right by a fixed or present number of spaces
- (ii) Enter / carriage Return key Used to initiate command on the screen i.e. Pressed after each command.
- (iii) Shift Key Used to change letter case. Also used in conjunction with other keys for various Commands.
(b) Simulation is one of the application areas of computers
Name two types of buses found on the computer motherboard
- Address bus
- Data bus/SATA bus/IDE/ATA/ I/O
- Control bus
(b) State the purpose of each of the types of buses named in (a) above
- Address bus - Memory location/used to locate storage positions/transmit memory locations
- Data bus- Data transmission
- Control bus- Transmit control signals! transmit instruction signals
A school has brought a computer system. The hardware items include: 800 MHz processor, 640 MB of RAM, a sound card, speakers, a monitor, a keyboard, a 12 GB hard disk, a floppy disk drive, CDRW drive, a mouse, a modem, an inkjet printer and a joystick. The software supplied includes: an OS, a BASIC interpreter and the following packages: Spreadsheets, graphic, word processor, art database and games.
(a) List three input devices from the given specifications
- Keyboard
- Mouse
- Joystick
(a) What is utility software
these are system programs that provide a useful service to the user of the computer by proving facilities for performing tasks of a routine nature
(b) Give four examples of utility software
- Sort
- Editors
- File copying
- File maintenance
- Disk managers
- CHKDSK
- DEFRAG
- SCANDISK
List 3 differences between laser printer and a dot matrix printer
Laser
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(a) High print speed
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(b) Can do no multiple jobs
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(c) Quiet printing
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(d) Uses photocopier technology
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(e) High print quality
Dot matrix
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(a) Low printing speed
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(b) Can do multiple printing
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(c) Noisy printing
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(d) Characters formed by combination of dots
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(e) Low print quality
With reference to quality of print, noise level and cost, compare a dot matrix with a laser printer
31/12/2020
With reference to quality of print, noise level and cost, compare a dot matrix with a laser printer
(a) A company has decided to computerize their operations. They have decided to purchase packages instead of developing their own programs. Give three advantages and two disadvantages of this approach.
Advantages
- Saves on programming effort and exposure on the part of the user (client)
- The user gets a well- tried and tested program
- Relatively quick implementation results from use of package
- Purchaser does not have full control over the packages as would have been if it was developed in house
- Package is produced to meet general needs & may not be ideal for a particular customer
A computer specification has the following details:
- Pentium II
- 1.44 MB floppy disk drive
- 20 GB hard disk
- Full multimedia
- 17” SVGA monitor
- Pre installed operating system
- Pre- installed office suite
Give two reasons why optical disks are better storage media compared to floppy diskettes (2mks)
- Enormous storage capacity compared to floppy diskettes
- Faster access time and data transfer rates as compared to floppy diskettes
- Data Recorded on optical disks is not damaged by stray magnetic fields and surface problems like fingerprints, dusts etc.
(a) State two tasks of a processor (2mks)
(b) State the functions of I/O devices
- Input
Used to enter data into the computer in a form the computer can store & process e.g. keyboard, mouse. - Output
Used to display the results of processing e.g. printer, monitor
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